I'm working on a pic for a friend with every character, boss and pet in Castle Crashers. There's a lot more than I expected. :P I will update here and on my blog.
Initial rough layout and sketch:

Main characters line work:

Sketch 1 of basic composition with all the main characters and bosses:

Color test for main characters using Jesse Turners technique from Viking Squad:

Current linework progress. All the characters in. I just need to add the last of the pets (90%)... so many pets...

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Can you elaborate on that? What is that technique exactly?